JPH08142387A - Manufacture of electrostatic recording electrode sheet - Google Patents

Abstract

PURPOSE: To accurately efficiently form a fine recess in a predetermined area. CONSTITUTION: The surface of an insulating board 41 is formed with many electrode films 42, leads 43 and a pattern of a pair of front and rear dummy electrode films 44 by a copper foil having a thickness of about 3μm. Then, an insulating coating layer 45 of polyimide resin is formed on the surface of the board 41, and an antistatic layer 46 is formed on the entire surface of the layer 45. The rear surface of the board 41 is irradiated by a laser beam to form an opening 48, then the rear surface of the board 41 is irradiated by a laser beam 57 to relatively move the beam 57 with respect to the board 41 along the wider area than the area corresponding to the pattern of the film 42 and the film 44, thereby forming a recess 49 of the depth of the entirety of the thickness of the board 41.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrostatic recording electrode sheet formed by forming a plurality of openings and an electrode film in the vicinity of the openings on a sheet-shaped insulator, which is a copying machine, a printer,
The present invention relates to a method of manufacturing an electrostatic recording electrode sheet for use in an electrostatic recording type image forming apparatus equipped in a facsimile, plotter or the like.

[0002]

2. Description of the Related Art Conventionally, an aperture electrode body having a large number of minute apertures (apertures) and control electrodes attached to the outer periphery of each aperture, a toner transport roller and a back electrode located on both sides of the aperture electrode body are provided. , A toner supply mechanism for supplying the toner carrying roller with negatively charged toner, controlling the voltage applied to each control electrode, and controlling the voltage applied to each control electrode, through the electric field between the control electrode and the back electrode, An electrostatic recording type image forming apparatus configured to record toner on a recording medium (paper) by passing the toner through the opening,
Various proposals have been made (for example, JP-A-2-297570).
(See the official gazette).

As the aperture electrode body (electrostatic recording electrode sheet), a large number of openings and control electrodes (electrode films) are formed on a thin sheet-like insulating plate made of synthetic resin, for example, having a thickness of 25 μm. , The insulating plate is located on the toner transport roller side, and the control electrode is located on the back electrode side. By the way, in order to make pixels recorded with toner clear, it is desirable to strengthen the electric field from the control electrode to the toner transport roller. For that purpose, the drive voltage to the control electrode is increased or the control electrode and the toner are used. It is necessary to minimize the distance between the transport rollers. However, in view of the characteristics of the integrated circuit that drives the control electrodes, it is desirable that the drive voltage be suppressed to approximately 40 V or less, so it is desirable to make the insulating plate as thin as possible.

Therefore, it is conceivable that the insulating plate is made of a thinner insulating coating. In that case, since the thickness of the aperture electrode body is too small, the control electrode is reinforced on the side opposite to the insulating coating. It is necessary to provide a thin sheet-like insulating substrate having a thickness of about 50 to 100 μm, and to form an opening that penetrates the insulating coating and the insulating substrate inside the control electrode. However, when the size of the opening of the insulating substrate is as small as the size of the opening inside the control electrode, the opening is formed through the opening of the insulating substrate from the back electrode to the control electrode. Since almost no electric field is generated,
It is necessary to form the opening of the insulating substrate in a wide concave portion that does not penetrate at least the insulating coating, and the width x length of the concave portion (a region in which a large number of control electrodes are formed in a predetermined pattern) is
For example, in the case of A4 size, the size is 1 mm × 200 mm.

Conventionally, excimer laser light has been used for finely processing the above-described insulating substrate, but the maximum heat generation amount of excimer laser light is 0.5 joule / c.
m ² and the maximum irradiation area is 22.5 mm ² , using the conventional processing technology, using an excimer laser beam, 1 mm ×
In the case of processing a slit-shaped concave portion in a processing area of about 200 mm, the processing area is divided into 9 parts, and the processing is performed through irradiation of excimer laser light 9 times.

[0006]

As described above, in the case where a processing region in which a large number of control electrodes are formed in a predetermined pattern is divided into 9 parts to form recesses by processing 9 times, the edge of the laser beam is Since the energy density is low at the corresponding part, a plurality of discontinuous seams are generated, and the discontinuous seams affect the electric field, and the recording performance is not uniform over many control electrodes. It is difficult to sufficiently improve the recording performance of electronic recording. It is an object of the present invention to provide a method for manufacturing an electrostatic recording electrode sheet, which can accurately and efficiently form fine recesses in a predetermined region without generating the discontinuous seam.

[0007]

According to a first aspect of the present invention, there is provided a method of manufacturing an electrode sheet for electrostatic recording, comprising: a pattern forming step of forming a plurality of electrode film patterns on a surface of a sheet-shaped insulating substrate; A coating step of forming an insulative coating layer on the surface of the insulative substrate so as to cover the pattern of the electrode film, and irradiating a laser beam from the back surface side of the insulative substrate opposite to the surface, thereby forming a plurality of electrode films. Along the region corresponding to the pattern, an opening forming step of forming an opening penetrating the insulating substrate and the insulating coating layer, and irradiating a laser beam from the back surface side opposite to the surface of the insulating substrate, By moving the laser light relative to the insulating substrate along a region wider than the region corresponding to the pattern of the plurality of electrode films, a recess having a depth of all or most of the thickness of the insulating substrate. Shape A method characterized in that a recess forming step of.

According to a second aspect of the present invention, in the method of manufacturing the electrode sheet for electrostatic recording according to the first aspect of the invention, in the pattern forming step, a concave portion forming step is formed in the vicinity of both ends in the length direction of the patterns of the plurality of electrode films. A dummy electrode film having a reflection surface larger than the incident cross section of the laser beam to be irradiated is formed, and in the step of forming the concave portion, irradiation of the laser beam is started from a portion corresponding to one dummy electrode film and the other dummy electrode film is formed. The method is characterized by terminating the irradiation of the laser beam at the portion corresponding to the electrode film.

[0009]

In the method of manufacturing an electrode sheet for electrostatic recording according to claim 1, in the pattern forming step, a pattern of a plurality of electrode films is formed on the surface of a sheet-like insulating substrate, and then,
In the coating process, an insulating coating layer is formed on the surface of the insulating substrate so as to cover the patterns of the plurality of electrode films. Next, in the opening forming step, laser light is irradiated from the back surface side opposite to the front surface of the insulating substrate to penetrate the insulating substrate and the insulating coating layer along the region corresponding to the pattern of the plurality of electrode films. An opening is formed.
However, since the laser light is reflected by the electrode film, it becomes an opening that does not penetrate through the electrode film.

Next, in the step of forming the concave portion, laser light is irradiated from the back surface side of the insulating substrate opposite to the front surface, and the laser light is irradiated along the area wider than the area corresponding to the pattern of the plurality of electrode films. Light is moved relative to the insulative substrate to form recesses at a depth of most or most of the thickness of the insulative substrate. In this case, in relation to the output of the laser light, by setting the relative movement speed to an appropriately high speed, it is possible to form the recesses having the depth of all or most of the thickness of the insulating substrate.

According to a second aspect of the present invention, there is provided the method of manufacturing the electrode sheet for electrostatic recording according to the first aspect, wherein in the pattern forming step, the concave portions are formed in the vicinity of both ends in the length direction of the patterns of the plurality of electrode films. A dummy electrode film having a reflection surface larger than the incident cross section of the laser light to be irradiated in the process is formed, and in the recess forming process, irradiation of the laser light is started from a portion corresponding to one dummy electrode film and the other dummy is formed. Irradiation of laser light is completed at the portion corresponding to the electrode film. At the start and end of the irradiation of the laser beam, the relative movement speed of the laser beam with respect to the insulating substrate cannot be sufficiently increased, so that it is not possible to form a concave portion having a desired depth, and a penetrating concave portion can be formed. There is.

However, according to the present invention, dummy electrode films having a reflection surface larger than the incident cross section of the laser light irradiated in the recess forming step are formed in the vicinity of both ends in the length direction of the pattern of the plurality of electrode films. Since the irradiation of the laser light is started from the part corresponding to one dummy electrode film,
The recess at the start of irradiation does not become deeper than the dummy electrode film. Similarly, since the irradiation of the laser beam is finished at the portion corresponding to the other dummy electrode film, the recessed portion at the end of the irradiation will not be deeper than the dummy electrode film. In this way, desired recesses can be formed also at the irradiation start portion and the irradiation end portion of the laser beam.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. First, an image forming apparatus equipped with an electrostatic recording electrode sheet will be described, and then the electrostatic recording electrode sheet will be described. As shown in FIG. 1, the image recording apparatus 1 includes a sheet conveyance mechanism 10 for conveying a sheet P (image recording medium) and a fixing mechanism 20 in a main body frame 2.
A predetermined amount of toner 3, a toner supply mechanism 30, an electrostatic recording electrode sheet 40 attached to the upper end of a toner case 31 of the toner supply mechanism 30, and a back electrode roller 5.
0 is provided.

The sheet transport mechanism 10 includes a plurality of guide plates 12 to 14 for supporting the sheet P to be transported, a plurality of transport rollers 15 to 18, a transport roller 15,
16 and the transport rollers 17 and 18, a transport roller (not shown) that supports and transports a portion of the paper P at both ends in the width direction of several mm, and the paper in the paper cassette 11
A sheet feeding roller (not shown) for feeding sheets one by one, an electric motor (not shown) for driving the sheet conveying mechanism 10, and the like,
On the front side of the main body frame 2, there is provided a paper feed cassette 11 that stores a large number of paper sheets P, and on the rear side of the main body frame 2, a paper ejection tray 1 for receiving the recorded and ejected paper sheets P.
9 are provided.

The fixing mechanism 20 comprises a fixing roller 17 having a halogen lamp built therein and a pressing roller 18,
The fixing roller 17 and the pressing roller 18 are also used for the paper transport mechanism 10.

Next, the toner supply mechanism 30 will be described. The toner case 3 is slightly wider than the maximum width of the paper P in the direction orthogonal to the paper conveyance direction (from front to back).
A toner 3 having an electric insulation property, which will be described later, is accommodated in the inside 1. Inside the toner case 31, a toner supply roller 32 and a toner transport roller 33 are horizontally arranged in the left-right direction, and the rollers 32 and 33 are rotatably supported. Toner supply roller 32
Is made of a silicone foam, and the toner supply roller 32 transfers the toner 3 to the toner transport roller 33 and through frictional contact with the toner 3 the toner 3 is supplied.
To a negative polarity.

The toner carrying roller 33 has a structure in which a nickel sleeve is fitted around the outer circumference of a roller body made of synthetic resin foam made of an insulating material. The toner carrying roller 33 adheres to the surface of the toner carrying roller 33 by electrostatic force. Toner 3
Is conveyed in the direction of arrow A. The toner supply roller 32 and the toner transport roller 33 are rotationally driven in the arrow B direction and the arrow A direction by a roller driving mechanism (not shown). A toner regulating blade 34 made of an insulating material having a thin plate-like elasticity is attached to the toner case 31, and a curved portion of the toner regulating blade 34 is in pressing contact with the toner conveying roller 33. The layer thickness of the toner 3 attached in layers is regulated to a predetermined thickness (about 40 to 50 μm) by the toner regulation blade 34.

The upper end portion of the toner case 31 substantially covers the upper end opening portion of the toner case 31 and contacts the upper end portion of the toner transport roller 33 from above via the layered toner 3. An electrostatic recording electrode sheet 40 that is inclined like a roof is attached. The electrode sheet 40 for electrostatic recording will be described. As shown in FIGS. 1 to 6, the electrode sheet 40 for electrostatic recording has a thickness of about 50 to 10.
A sheet-shaped insulating substrate 41 made of 0 μm synthetic resin (for example, polyimide), and a large number of copper coating films formed on the lower surface of the insulating substrate 41 at predetermined intervals in the horizontal direction orthogonal to the conveyance direction. A U-shaped electrode film 42, a conductive wire 43 extending from the electrode film 42, and a synthetic resin (for example, polyimide)
It is provided with an insulating coating layer 45 having a thickness of about 8 μm and a semiconductive antistatic layer 46 having a thickness of about 5 μm in which carbon fine particles are mixed with a synthetic resin (for example, polyimide).

A large number of electrode films 42 are formed in a row in the left-right direction at predetermined minute intervals at a position substantially in the center of the electrostatic recording electrode sheet 40 in the front-rear direction. 65 μm × 6 which penetrates through the insulating coating layer 45 and the antistatic layer 46 between the inside of 42 and between the electrode films 42.
Apertures 47 (micro openings) of 5 μm are formed, and the pitch between these apertures 47 is about 127 μm. For example, when targeting A4 paper, the number of apertures 47 (that is, the number of electrode films 42) is , About 1,700.

Further, as shown in FIGS. 2 and 6, there is a recess 49 which includes a region in which a large number of electrode films 42 are formed and is wider in the front-rear direction than the region, and the electrodes are formed from the upper surface of the insulating substrate 41. A recess 49 having a depth up to the film 42, that is, a depth substantially over the entire thickness of the insulating substrate 41 is formed. Thin conductive wires 43 extending from each electrode film 42 are respectively formed on the insulating substrate 41. As shown in FIG.
In each of the three, +, depending on the image signal of the image to be recorded,
The drive voltage of 30 V or −30 V is individually supplied from the drive circuit 52 via the control line 54.

On the other hand, immediately above the electrode sheet 40, the rear electrode roller 50 is provided with a conveyance gap for conveying the sheet P therebetween.
The rear electrode roller 50 is provided with a support shaft 5
It is rotatably supported by the main body frame 2 via 0a. The paper P is transported in the transport direction while being in contact with the lower portion of the back electrode roller 50, and the lower surface of the paper P is transferred from the surface of the toner transport roller 33 according to the drive signal supplied to the electrode film 42 during the transport. The toner 3 flying and passing through the aperture 47 is attached. The back electrode roller 50 is rotationally driven in the direction of arrow C in synchronization with the conveyance of the recording paper P by a roller driving mechanism (not shown).

Next, the control system of the image recording apparatus 1 will be briefly described. As shown in FIG. 2, a high voltage of about +1 KV is constantly applied to the back electrode roller 50 by the power supply circuit 55, and the back electrode roller 50 becomes negative. The charged toner 3 is attracted to the back electrode roller 50 by a large electrostatic force. On the other hand, the many conductive wires 43 of the electrode sheet 40 are
The drive circuit 5 is connected via a control line 54 composed of a large number of signal lines.
2 is connected to this drive circuit 52, and + 30V and -3
A power supply circuit 53 that outputs two voltages of 0 V and a control unit 51 that receives an image signal from the outside are connected,
The control unit 51 simultaneously outputs a control signal corresponding to an image signal for a large number of electrode films 42 to the drive circuit 52, and the drive circuit 52 applies +30 V to each electrode film 42 for recording pixels.
Drive voltage is output via the control line 54, and a drive voltage of -30 V is output via the control line 54 to each electrode film 42 that does not record pixels. The toner transport roller 33
Is grounded.

Therefore, when a voltage of +30 V is applied to the electrode film 42, an electric field is generated from the electrode film 42 toward the toner transport roller 33, and the toner 3 charged negatively is
The toner transport roller 33 receives electrostatic force from this electric field.
While passing through the aperture 47 and the electrode film 42 from the surface of the back surface,
In response to an electrostatic force generated by a strong electric field directed toward, the paper flies toward the back electrode roller 50 and collides with and adheres to the paper P.
However, when the voltage of −30 V is applied to the electrode film 42, the toner 3 does not fly from the toner transport roller 33.

In the electrostatic recording electrode sheet 40 described above, since the thin insulating coating layer 45 and the thin antistatic layer 46 are only formed on the lower surface side of the electrode film 42, the toner is conveyed from the electrode film 42. The distance to the roller 33 is reduced to reduce the distance from the electrode film 42 to the toner transport roller 3
The electric field generated between the three can be strengthened, and a recess 49 that is wider in the front-back direction than the plurality of apertures 47 and extends from the upper surface of the insulating substrate 41 to the electrode film 42 or near the electrode film 42 is formed. Therefore, the insulating substrate 41 for reinforcement
Therefore, it is possible to reliably prevent the electric field generated between the back electrode roller 50 and the electrode film 42 from being adversely affected. In this way, the electrical performance of the electrostatic recording electrode sheet 40 is improved.

Next, a method for manufacturing the electrostatic recording electrode sheet 40 described above will be described. In the pattern forming step, as shown in FIG. 3, a sheet-shaped insulating substrate 41 having a predetermined size is prepared, and a copper foil having a thickness of about 3 μm is provided on the surface (lower surface in FIG. 2) of the insulating substrate 41. The entire surface is adhered, and a large number of electrode films 42 and conducting wires 4 are formed on the surface of this copper foil.
3 and a pair of front and rear dummy electrode films 44 are masked in a masked state, and an etching process is performed with a predetermined etching solution to provide a large number of electrode films 42 and conductive wires 43.
And a pattern of a pair of front and rear dummy electrode films 44 is formed. In addition, the pair of dummy electrode films 44 is composed of a large number of electrode films 42.
Is formed in the vicinity of both ends in the length direction of the pattern (the horizontal direction in FIG. 2, that is, the direction orthogonal to the paper surface in FIG. 2). Further, each dummy electrode film 44 is formed in a rectangular shape having a reflection surface larger than the incident cross section of the laser beam 57 of the excimer laser in the recess forming step described later.

Next, in the coating step, as shown in FIG. 4, polyimide is formed on the entire surface of the insulating substrate 41 so as to cover a large number of electrode films 42, conductors 43 and a pair of front and rear dummy electrode films 44. A resin is coated to form an insulating coating layer 45 having a thickness of about 8 μm. next,
After the insulating coating layer 45 is sufficiently dried, the entire surface of the insulating coating layer 45 is coated with a polyimide resin containing carbon fine powder to form an antistatic layer 46 having a thickness of about 5 μm and dried. Let

Next, in the opening forming step, as shown in FIG. 5, the insulating substrate 41 is set on a uniaxial movable carrier which can be driven to move at a desired set speed, and the insulating substrate 41 is provided on the opposite side of the surface. From the back surface of the plurality of electrode films 42 and 1
A laser beam 56 of an excimer laser is set so as to be irradiated from one end side to the other end side along a region corresponding to the pattern of the pair of dummy electrode films 44. Then, the laser light 56 is irradiated from the back surface of the insulating substrate 41 opposite to the front surface, and the laser light 56 is irradiated along the region corresponding to the pattern of the plurality of electrode films 42 and the pair of dummy electrode films 44. An opening 48 that is moved relative to the insulating substrate 41 and penetrates the insulating substrate 41, the insulating coating layer 45, and the antistatic layer 46, and includes the plurality of apertures 4.
An opening 48 for forming 7 is formed (see FIG. 6).
Before the irradiation with the laser light 56, a predetermined release agent is applied to the entire back surface of the insulating substrate 41, and then the laser light 56 is applied.
Shall be irradiated.

Irradiation of the laser beam 56 is started from the part of the dummy electrode film 44 on the one end side, and is ended at the part of the dummy electrode film 44 on the other end side. The front-back direction width a of the incident section of the laser beam 56 is the aperture 4
7, the width 65 in the front-rear direction, the width b in the left-right direction of the incident cross section of the laser light 56 are, for example, 200 μm, the energy density of the laser light 56 is 0.5 joule / cm ² , and the laser light 5
The frequency of 6 is 100 Hz, and the relative moving speed of the laser light 56 with respect to the insulating substrate 41 is 40 mm / s, for example. When the opening 48 that penetrates the insulating substrate 41, the insulating coating layer 45, and the antistatic layer 46 is formed, the laser light 56 is reflected at the portion of the electrode film 42.
As shown in FIG. 6, each electrode film 4 does not penetrate the electrode film 42.
An insulating coating layer 45 and an antistatic layer 46 remain in a bridge shape on the side opposite to the laser light incident side of 2, and a large number of apertures 47 corresponding to each electrode film 42 are formed.

Next, in the recess forming step, as shown in FIG. 6, with the insulating substrate 41 set in the carrier, a plurality of electrode films 42 and a plurality of electrode films 42 are formed from the back surface of the insulating substrate 41 opposite to the front surface. The excimer laser light 57 is emitted from one end side toward the other end side along a region wider than the region corresponding to the pattern of the pair of dummy electrode films 44.
Is set so that it can be irradiated. Then, the laser beam 57 is irradiated from the back surface of the insulating substrate 41 opposite to the front surface,
The thickness of the insulating substrate 41 is increased by moving the laser beam 57 relative to the insulating substrate 41 along a region wider than the region corresponding to the pattern of the plurality of electrode films 42 and the pair of dummy electrode films 44. A recess 49 having the entire depth is formed. However, the recess 49 may be formed to a depth of most of the thickness of the insulating substrate 41.

Irradiation of the laser beam 57 is started from the portion of the dummy electrode film 44 on the one end side, and is terminated at the portion of the dummy electrode film 44 on the other end side. The width c of the incident cross section of the laser beam 57 in the front-rear direction is 1000 μm.
m, the lateral width d of the incident cross section of the laser beam 57 is, for example, 200 μm, the energy density of the laser beam 57 is 0.5 Joule / cm ² , and the frequency of the laser beam 57 is 100 H.
The relative moving speed of z and the laser beam 57 with respect to the insulating substrate 41 is, for example, 65 mm / s. At the irradiation start end and the irradiation end end of the laser light 57, the heat input amount does not become constant because the relative movement speed does not become constant, but the irradiation is started at the part of the dummy electrode film 44 on one end side, and the other end side Since the irradiation is finished at the part of the dummy electrode film 44, the sectional shape of the recess 49 becomes constant in the region corresponding to all the apertures 47.

In this manner, the opening 48 can be formed in a uniform shape without variation and the recess 49 can be formed in a uniform shape without variation, so that the electrostatic recording electrode sheet 40 of high electrical performance can be manufactured. it can. Then, since the irradiation is started at the part of the dummy electrode film 44 on the one end side and the irradiation is ended at the part of the dummy electrode film 44 on the other end side, the laser beam 57 irradiation start part and irradiation end part are also desired. Can be formed.

[0032]

According to the method of manufacturing an electrode sheet for electrostatic recording of claim 1, a plurality of electrode film patterns are formed on the surface of a sheet-like insulating substrate in the pattern forming step,
Next, in the coating step, an insulating coating layer is formed on the surface of the insulating substrate so as to cover the patterns of the plurality of electrode films. Next, in the opening forming step, the insulating substrate is irradiated with laser light from the back surface side opposite to the surface,
An opening penetrating the insulating substrate and the insulating coating layer is formed along a region corresponding to the pattern of the plurality of electrode films. Therefore, a continuous opening having a constant width can be formed.

Next, in the recess forming step, laser light is irradiated from the back surface side of the insulating substrate opposite to the front surface, and the laser light is irradiated along the area wider than the area corresponding to the pattern of the plurality of electrode films. Light is moved relative to the insulative substrate to form recesses at a depth of most or most of the thickness of the insulative substrate. In this way, since the laser light is moved relative to the insulating substrate to form the concave portion, it is possible to easily form a smooth continuous concave portion having a constant width and depth. Therefore, the opening can be formed in a uniform shape without variation, and the recess can be formed in a uniform shape without variation, so that an electrically high-performance electrostatic recording electrode sheet can be manufactured.

In the method of manufacturing the electrode sheet for electrostatic recording according to the second aspect, the same effect as that of the first aspect can be obtained, but the concave portion forming step is performed at the portions in the vicinity of both ends in the length direction of the pattern of the plurality of electrode films. Since a dummy electrode film having a reflection surface larger than the incident cross section of the laser light to be irradiated is formed and the laser light irradiation is started from the portion corresponding to one dummy electrode film, the concave portion at the start of the irradiation is It will not be deeper than the dummy electrode film. Similarly, since the irradiation of the laser beam is finished at the portion corresponding to the other dummy electrode film, the recessed portion at the end of the irradiation will not be deeper than the dummy electrode film. In this way, desired recesses can be formed also at the irradiation start portion and the irradiation end portion of the laser beam.

[Brief description of drawings]

FIG. 1 is a partial vertical cross-sectional side view of an image forming apparatus according to an exemplary embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of a main part of the image forming apparatus in FIG.

3 is a perspective view of essential parts of an insulating substrate, an electrode film, and the like of the electrostatic recording electrode sheet of the image forming apparatus of FIG.

FIG. 4 is a perspective view of essential parts of an insulating substrate, an insulating coating layer, and an antistatic layer of the electrostatic recording electrode sheet.

FIG. 5 is a main part perspective view showing a step of forming an opening in the electrostatic recording electrode sheet.

FIG. 6 is a perspective view of a main part showing a step of forming a recess in the electrostatic recording electrode sheet.

[Explanation of symbols]

 1 Image Forming Apparatus 40 Electrostatic Recording Electrode Sheet 41 Insulating Substrate 42 Electrode Film 44 Dummy Electrode Film 45 Insulating Coating Layer 46 Antistatic Layer 48 Opening 49 Recess 56, 57 Laser Light

Claims (2)

[Claims] 1. A pattern forming step of forming a pattern of a plurality of electrode films on a surface of a sheet-shaped insulating substrate, and an insulating coating layer on the surface of the insulating substrate so as to cover the patterns of the plurality of electrode films. A coating step of forming and irradiating a laser beam from the back surface side opposite to the front surface of the insulating substrate, penetrating the insulating substrate and the insulating coating layer along the region corresponding to the pattern of the plurality of electrode films. An opening forming step of forming an opening to be irradiated with laser light from the back surface side opposite to the surface of the insulating substrate, along a region wider than a region corresponding to the pattern of the plurality of electrode films, An electrostatic recording comprising: a recess forming step of moving the laser beam relative to the insulating substrate to form a recess having a depth of all or most of the thickness of the insulating substrate. for Method of manufacturing the electrode sheet. 2. A dummy electrode film having a reflection surface larger than an incident cross section of a laser beam irradiated in the concave portion forming step, in a portion near both ends in a length direction of a pattern of a plurality of electrode films in the pattern forming step. And irradiating the laser beam from a portion corresponding to one dummy electrode film in the step of forming the recess, and terminating the laser beam irradiation at a portion corresponding to the other dummy electrode film. The method of manufacturing an electrode sheet for electrostatic recording according to claim 1.